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<?php
/**
* Copyright (C) Marcelle Hövelmanns, art solution - All Rights Reserved
*
* @file Collection.php
* @author Marcelle Hövelmanns
* @site http://www.artsolution.de
* @date 10.10.17
*/
namespace AffiliconApiClient\Models;
use AffiliconApiClient\Exceptions\KeyHasUseException;
use AffiliconApiClient\Exceptions\KeyInvalidException;
class Collection
{
/**
* Current index
* @var int
*/
protected $intIndex = -1;
/** @var array */
private $items = [];
/**
* @param $obj
* @param string $key
* @throws KeyHasUseException
*/
public function addItem($obj, $key = null) {
if ($key === null) {
$this->items[] = $obj;
}
else {
if (isset($this->items[$key])) {
throw new KeyHasUseException($key);
}
else {
$this->items[$key] = $obj;
}
}
}
/**
* @param $key
* @throws KeyInvalidException
*/
public function deleteItem($key) {
if (isset($this->items[$key])) {
unset($this->items[$key]);
}
else {
throw new KeyInvalidException($key);
}
}
/**
* @param $key
* @return mixed
* @throws KeyInvalidException
*/
public function get($key) {
if (isset($this->items[$key])) {
return $this->items[$key];
}
else {
throw new KeyInvalidException("Invalid key $key.");
}
}
/**
* Return the key of the current element
*/
public function key()
{
return key($this->items);
}
/**
* @return array
*/
public function keys()
{
return array_keys($this->items);
}
/**
* @return int
*/
public function count()
{
return count($this->items);
}
/**
* Go to the first item
* @return static The collection object
*/
public function first()
{
$this->intIndex = 0;
return $this;
}
/**
* @param $key
* @return bool
*/
public function exists($key)
{
return isset($this->items[$key]);
}
/**
* Checks if current position is valid
*/
public function valid()
{
return array_accessible($this->valid());
}
/**
* Go to the previous item
* @return static|false The collection object or false if there is no previous item
*/
public function rewind()
{
if ($this->intIndex < 1) {
return null;
}
--$this->intIndex;
return $this;
}
/**
* Return then current item
* @return mixed
*/
public function current()
{
if ($this->intIndex < 0) {
$this->first();
}
return $this->items[$this->intIndex];
}
/**
* Go to the next item
* @return static|boolean The collection object or false if there is no next item
*/
public function next()
{
if (!isset($this->items[$this->intIndex + 1])) {
return null;
}
++$this->intIndex;
return $this;
}
/**
* Go to the last item
* @return static The collection object
*/
public function last()
{
$this->intIndex = count($this->items) - 1;
return $this;
}
/**
* Reset the item
* @return static The collection object
*/
public function reset()
{
$this->intIndex = -1;
return $this;
}
}